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Mergers and Acquisitions (Textual) (Details)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Aug. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition        
Credit facility drawn   $ 426,002 $ 372,882  
Merger expenses   0 8,522 $ 61,134
Line of Credit        
Business Acquisition        
Credit facility drawn $ 125,000 $ 0 $ 19,963  
Repayments of lines of credit 25,000      
Talmer        
Business Acquisition        
Acquisition purchase price $ 1,612,449      
Stock consideration given (in shares) | shares 32.1      
Exchange ratio of common stock issued 0.4725      
Share price (in dollars per share) | $ / shares $ 1.61      
Repayments of lines of credit $ 37,500